Finding the Third Proportional to 431,259 and 617,530.50

Step by Step Solution

1. Step 1: Write the proportion equation
   431,259 : 617,530.50 = 617,530.50 : x
2. Step 2: Convert to fraction form
   431,259/617,530.50 = 617,530.50/x
3. Step 3: Cross multiply
   431,259x = 617,530.50 × 617,530.50
4. Step 4: Simplify right side
   431,259x = 381,343,918,430.25
5. Step 5: Solve for x
   x = 381,343,918,430.25/431,259
6. Step 6: Final answer
   x = 884,257.30